48 lines
1.6 KiB
Lua
48 lines
1.6 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "Simple Amp",
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category = "Example",
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license = "MIT",
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author = "Ardour Team",
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description = [[
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An Example DSP Plugin for processing audio, to
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be used with Ardour's Lua scripting facility.]]
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}
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-- return possible i/o configurations
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function dsp_ioconfig ()
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-- -1, -1 = any number of channels as long as input and output count matches
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return { [1] = { audio_in = -1, audio_out = -1}, }
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end
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-- optional function, called when configuring the plugin
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function dsp_configure (ins, outs)
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-- store configuration in global variable
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audio_ins = ins:n_audio();
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local audio_outs = outs:n_audio()
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assert (audio_ins == audio_outs)
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end
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-- this variant asks for a complete *copy* of the
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-- audio data in a lua-table.
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-- after processing the data is copied back.
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--
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-- this also exemplifies the direct "connect and run" process function,
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-- where the channel-mapping needs to be done in lua.
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function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
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for c = 1,audio_ins do
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-- Note: lua starts counting at 1, ardour's ChanMapping::get() at 0
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local ib = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped input buffer for given channel
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local ob = out_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped output buffer for given channel
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assert (ib ~= ARDOUR.ChanMapping.Invalid);
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assert (ob ~= ARDOUR.ChanMapping.Invalid);
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local a = bufs:get_audio (ib):data (offset):get_table(n_samples) -- copy audio-data from input buffer
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for s = 1,n_samples do
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a[s] = a[s] * 2; -- amplify data in lua table
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end
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bufs:get_audio(ob):data(offset):set_table(a, n_samples) -- copy back
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end
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end
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